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Share-Based Compensation - Additional Information (Details) - shares | Oct. 11, 2024 | Jun. 03, 2024 | Aug. 28, 2023 | Sep. 30, 2024 | Nov. 30, 2023
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Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Market price of common stock |  |  | 85.00% |  |
Consecutive offering period |  |  | 6 months |  |
Employee Stock Purchase Plan | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee stock purchase plan of payroll deductions |  |  | 10.00% |  |
Employee Stock Purchase Plan | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee stock purchase plan of payroll deductions |  |  | 15.00% |  |
Employee Stock Purchase Plan | Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock authorized for issuance under the plan (in shares) |  |  |  |  | 13,450,000
Employee Stock Purchase Plan | Coherent, Inc. Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted (in shares) |  |  |  | 0 |
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Units granted (in shares) |  | 147,214 |  |  |
Award vesting period |  | 3 years |  |  |
RSUs | Share-Based Payment Arrangement, Tranche One | Subsequent Event |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Units granted (in shares) | 15,902 |  |  |  |
Award vesting period | 3 years |  |  |  |
RSUs | Share-Based Payment Arrangement, Tranche Two | Subsequent Event |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Units granted (in shares) | 63,154 |  |  |  |
Award vesting period | 2 years |  |  |  |
Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Units granted (in shares) |  | 694,007 |  |  |
Award vesting period |  | 3 years |  |  |
Performance Shares | Subsequent Event |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Units granted (in shares) | 118,853 |  |  |  |
Award vesting period | 3 years |  |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Line items represent financial concepts included in a table. 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